/*
 * Copyright � 2002-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System.Runtime.Serialization;

namespace Spring.Expressions;

/// <summary>
/// Base class for binary operators.
/// </summary>
/// <author>Aleksandar Seovic</author>
[Serializable]
public abstract class BinaryOperator : BaseNode
{
    /// <summary>
    /// Create a new instance
    /// </summary>
    protected BinaryOperator()
    {
    }

    /// <summary>
    /// Create a new instance with the supplied operands
    /// </summary>
    /// <param name="left"></param>
    /// <param name="right"></param>
    protected BinaryOperator(BaseNode left, BaseNode right)
    {
        base.addChild(left);
        base.addChild(right);
    }

    /// <summary>
    /// Create a new instance from SerializationInfo
    /// </summary>
    protected BinaryOperator(SerializationInfo info, StreamingContext context)
        : base(info, context)
    {
    }

    /// <summary>
    /// Gets the left operand.
    /// </summary>
    /// <value>The left operand.</value>
    public BaseNode Left
    {
        get { return (BaseNode) this.getFirstChild(); }
    }

    /// <summary>
    /// Evaluate the left operand
    /// </summary>
    protected object GetLeftValue(object context, EvaluationContext evalContext)
    {
        return GetValue(Left, context, evalContext);
    }

    /// <summary>
    /// Gets the right operand.
    /// </summary>
    /// <value>The right operand.</value>
    public BaseNode Right
    {
        get { return (BaseNode) this.getFirstChild().getNextSibling(); }
    }

    /// <summary>
    /// Evaluate the left operand
    /// </summary>
    protected object GetRightValue(object context, EvaluationContext evalContext)
    {
        return GetValue(Right, context, evalContext);
    }
}
